Tile support to show travel exclusions.

Added status graphic for poisoned monsters. Changing tile storage type from unsigned short to unsigned int to have room for more flag bits.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3300 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on January 18, 2008
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